The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 03, 2012
Filed:
Mar. 24, 2008
Venugopalan Ramasubramanian, Mountain View, CA (US);
Thomas L. Rodeheffer, Mountain View, CA (US);
Douglas B. Terry, San Carlos, CA (US);
Meg Walraed-sullivan, San Diego, CA (US);
Edward P. Wobber, Menlo Park, CA (US);
Venugopalan Ramasubramanian, Mountain View, CA (US);
Thomas L. Rodeheffer, Mountain View, CA (US);
Douglas B. Terry, San Carlos, CA (US);
Meg Walraed-Sullivan, San Diego, CA (US);
Edward P. Wobber, Menlo Park, CA (US);
Microsoft Corporation, Redmond, WA (US);
Abstract
A distributed system includes full and partial replicas of a set of data items that may be inserted, modified, or deleted by any replica. Replicas may occasionally synchronize with other arbitrarily chosen replicas to learn about updates. A replica's knowledge includes one or more knowledge fragments, where each fragment indicates a set of items. A type of knowledge fragment, called a star knowledge fragment, contains versions associated with all items in the system. Star knowledge fragments are compact because the set of items stored at a replica need not be explicitly listed. Once all replicas know of all updates in the system, partial and full replicas will have the same compact star knowledge fragment.